Malicious PDF — malware analysis report

Static analysis result for SHA-256 5253de268d36bee5…

MALICIOUS

PDF

83.3 KB Created: 2021-09-03 18:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eb6dd9445bb3d129147d32cc61ddc81a SHA-1: 524bcc0c5ca4b7297c1129bcbf1e1808bbc5be9b SHA-256: 5253de268d36bee5fdabcdf9f6151b755166ff1157815bbd30fff6dcb62c2530
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, a common technique for executing malicious code. It also features a link farm pointing to various domains, many of which appear to be compromised CMS uploads, suggesting an attempt to host or distribute further payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://lamachine.nl/userfiles/file/towuxivixudawevu.pdf In PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/xapitetuxavarin.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/9cjoggtnjuj0ea399no54fp9b9/gesopujipigon.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/4hcu4j3vmd8st95hhevj2t7sjs/texexofatabisegifunekani.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/dusil.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/pekonufuvemajunodugofoz.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/kulireworiwilix.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/supajuvo.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/gipegumeridoxetuvutovawu.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/rukuzefasoxuxedarew.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/pemaxeriruresoxixowilaliz.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/manulanufazelokabawofus.pdfIn PDF document text
    • http://nhs71.com/clients/d/d9/d9c6bfbc4bbdd207836d30c01fe5869c/File/56819302665.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/bb4m5c5s59qtgtesto7hl2543v/wogigaledevakominuzugo.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dafb83ea04---banujupowupuvudutokizeri.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab61e3079f2---gukumunokelegalaz.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86357784433.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210823183011.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160aaed166945d---7787197885.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/88762337201.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/2d653b51db42658937eef38efecd2572/lepavefipolejubuvidaledi.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/c759d725594e04422d4ab3acf2a1b9bf/71440402560.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/rosopulasedekufipof.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16076988b76f73---89859965718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=nonlinear+control+systems+and+power+system+dynamics+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90E 10956 bytes
SHA-256: 70b199f04f4d67942de4c93ecfe2415e38435ae4f2732caf25893e4da493367f
font_02_sfnt_off00011287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11287 17412 bytes
SHA-256: 4f678013a232720ee976348628e287453d63c5799c642479accbba7ea764a016

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